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Understanding the coercivity mechanism of nanocomposite magnets is essential for developing high-performance permanent magnets. In this study, the mechanism of coercivity enhancement in α -Fe/Nd 2 Fe 14 B nanocomposites with an intergranular amorphous phase has been studied. The homogeneity and strength of domain-wall pinning in the magnets are enhanced by the existence of an intergranular amorphous phase. The suitable exchange constant and thickness of the amorphous interface are favourable for simultaneously obtaining high coercivity and strong exchange coupling between hard and soft grains. The present work provides a way to achieve high coercivity in nanocomposite magnets by the modification of the interfacial structure.
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Zhang et al. (2013) studied this question.
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